yes, but if you have the fans, keep adding them until its too loud.
remember, you want airflow, not all intake. (intake in the front and bottom, output out the back and top. side fans are usually better if its input unless you have tons of intake already)
if I remember correctly that the NZXT Phantom has space for a mahooosize fan ie 200mm and in which case (Pun intended) it will make less noise so is better than a 120 opr 140
The only downside to all those fans is the noise. Just as long as you have good airflow all those extra fans really aren't necessary but in the end it's really up to you isn't it?